I cleaned the chamber very thoroughly and took some 1500 grit sandpaper and wrapped it around a dowel. By hand, I turned the dowel about 20 times and recleaned the chamber. In addition, I made sure that every case was "double-sized". Took it out this morning and it went right through 20 rounds, roughly split between 40, 42 and 45 grains of H4895 behind a 125g Sierra SP. It failed to feed only one case from the magazine but the other 19 worked flawlessly.
So I guess it's working now, I just need to develop an accuracy load. It seems that 45g of H4895 gave the best groups (about 2" at 50 yards) using WLRM primers. The 40g rounds produced a 5" group.
Thanks for the tips, this really is a fun rifle to shoot. My only complaint is that is seems hard on the cases (lots of dents) and it spits the brass 30 feet directly in front of you.
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